Question

我有这样的表：

 Serial      IO
----------------------------------------------------
    1       i
    2       i
    3       i
    1       o

预期结果：o列

中没有IO的所有序列号

 Serial      IO
-----------------------------------------------------
    2       i
    3       i

例如，序列1在i列中同时包含o和IO，这就是它不会出现在结果窗格中的原因。

Answer 1

您可以使用not exists：

select serial, io
from t
where not exists (select 1 from t t2 where t2.serial = t.serial and t2.io = 'o');

Answer 2

只是一种方式：

WITH i_table AS (SELECT serial,IO FROM my_table WHERE IO = 'i'),
o_table AS (SELECT serial,IO FROM my_table WHERE IO = 'o')
SELECT DISTINCT i.* 
FROM i_table AS i 
    LEFT JOIN o_table AS o 
    ON i.serial = o.serial 
WHERE o.serial IS NULL;

Answer 3

NOT EXISTS和类似的方法有效。根据使用Windows /分析函数的索引，可以有不同的性能配置文件......

WITH
  sized AS
(
  SELECT
    yourTable.*,
    COUNT(*) OVER (PARTITION BY IO)   AS group_size
  FROM
    yourTable
)
SELECT
  *
FROM
  sized
WHERE
  group_size = 1

Answer 4

请尝试以下代码。

select t.Serial,t.IO from table1 t inner join 
(select Serial from table1 group by Serial 
having count(distinct IO) = 1) t2 ON t.Serial = t2.Serial
where t.IO != 'o'

Demo

Answer 5

试试这个：

select distinct * from MY_TABLE
where [Serial] not in (select [Serial] from MY_TABLE where [IO] = 'o')

Answer 6

您可以离开加入并排除那些匹配

的人

SELECT
  a.Serial,
  a.[IO]
FROM <table> a
LEFT JOIN
  <table> b
ON a.Serial = b.Serial
  and b.[IO] = 'o'
WHERE
  a.[IO] = 'i' 
  and b.[IO] is null

Answer 7

不是最有效但很短的

select Serial, io  from table where 'io' = 'i'
except 
select Serial, 'i' from table where 'io' = 'o'

仅查询sql server中的唯一行

7 个答案: